Commit 82b070be authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Greg Kroah-Hartman
Browse files

driver core: Introduce device_find_any_child() helper 



There are several places in the kernel where this kind of functionality is
being used. Provide a generic helper for such cases.

Reviewed-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220610120219.18988-1-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 9cbffc7a

drivers/base/core.c

+20 −0
Original line number Diff line number Diff line
@@ -3920,6 +3920,26 @@ struct device *device_find_child_by_name(struct device *parent, 
}

EXPORT_SYMBOL_GPL(device_find_child_by_name);



static int match_any(struct device *dev, void *unused)

{

	return 1;

}



/**

 * device_find_any_child - device iterator for locating a child device, if any.

 * @parent: parent struct device

 *

 * This is similar to the device_find_child() function above, but it

 * returns a reference to a child device, if any.

 *

 * NOTE: you will need to drop the reference with put_device() after use.

 */

struct device *device_find_any_child(struct device *parent)

{

	return device_find_child(parent, NULL, match_any);

}

EXPORT_SYMBOL_GPL(device_find_any_child);



int __init devices_init(void)

{

	devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);

include/linux/device.h

+2 −0
Original line number Diff line number Diff line
@@ -905,6 +905,8 @@ struct device *device_find_child(struct device *dev, void *data, 
				 int (*match)(struct device *dev, void *data));

struct device *device_find_child_by_name(struct device *parent,

					 const char *name);

struct device *device_find_any_child(struct device *parent);



int device_rename(struct device *dev, const char *new_name);

int device_move(struct device *dev, struct device *new_parent,

		enum dpm_order dpm_order);